Coronal Shock Waves, EUV waves, and Their Relation to CMEs. I. Reconciliation of "EIT waves", Type II Radio Bursts, and Leading Edges of CMEs

TL;DR

This paper investigates the relationship between coronal shock waves, EUV waves, and CMEs, proposing a model that links their observed kinematics and radio signatures to better understand solar eruptive phenomena.

Contribution

It introduces a simple quantitative model that reconciles EUV wave propagation, type II radio burst drift rates, and CME leading edge kinematics.

Findings

Close correspondence between type II burst drift rates and EUV wave speeds

EUV waves and Moreton waves are consistent with shock waves from eruptions

Model explains differences in wave propagation due to plasma density falloff

Abstract

We show examples of excitation of coronal waves by flare-related abrupt eruptions of magnetic rope structures. The waves presumably rapidly steepened into shocks and freely propagated afterwards like decelerating blast waves that showed up as Moreton waves and EUV waves. We propose a simple quantitative description for such shock waves to reconcile their observed propagation with drift rates of metric type II bursts and kinematics of leading edges of coronal mass ejections (CMEs). Taking account of different plasma density falloffs for propagation of a wave up and along the solar surface, we demonstrate a close correspondence between drift rates of type II bursts and speeds of EUV waves, Moreton waves, and CMEs observed in a few known events.